Ntghouse electbic



1. O.VLANGGUTH.

CIRCUIT INTERRUPTER.

APPLICATION FILED JULY I2, 1911.

1,313,092. Patented Aug. 12,1919

WITNESSES: INVENTOR u BY ' 7A1'T0RNEY Uni-TED sT' rEs PATENT our-Ion.

JOSEPH QJ ANGGUTHQQ wIL INsBUne, rnnnsnvniviiASfienon TO. WEST- HTGHOUSE ELECTRIC -& MANUFACTURING GOMPAI\IY A CORPORATION-F PENNSYLVANIA.

CIRGUIT-INTERRUPTER.

Patented Aug. 12, 1919.

Applicet'ion'filed July 12, 1917. Se'riaTNo. 180,070.

To all wh'qmlit may canceri:

,e itv own thatI', J'osnPH O. LANeGo'rH,

sacitizen' of'theiUnited States, anda resident .GfiWiIkinSbuI'g in'the county of Allegheny ii-1111 $tat'e' of -Pennsylvania, have invented a and usefnldmprovement in GircuitIn- 'terrupters ofwhich the following is a specificauon. r v

My invention relates to circuit interruptelfs'and'particularly to devices for positively locking the-movable members of knife-blade witches Kin the'o peni and closed positions ij thereof.v -I 1 One .object'of invention isto provide ai -,1 atchi1ig"devicethat shall be positive and simple] in: construction and applicable to knife-blade switches of existing types'with out any considerable alteration in, the struc- 'tures .thereof. I v

" J FiguI're 1 I ofthe accompanyingdrawings isa-sideelevational' view 'of a knife-blade "switchlenibodying my invention; Fig. 2 is'a detail view,- partially in elevation and par-- tiallyin section, of the same, and. Fig. 3 isa sectional View taken along the line I IIIII of-Fig. 2.

Referring to the drawings, a knife-blade member 1 is pivoted on a pin 2 that is minted in a terminal support 3 which'is ecured toa. base-4. The member 1 is adapt-.

ted. to be moved, in the usual manner, into {and outof engagement with contact mem bers 5 and 6 that are also secured to the base 4.

j ..The'terminal support .3 comprises a body portion 7 and jaw portions 8 which embrace one end of'the knife-blade member 1. A

slidable member 9 is disposed withinthe provided with an arcuate edge 13 and shoulders 14 and 15 that are adapted to permit rotative movement of the blade member 1 when in certain positions relative to it and to preyentisuch movement when incertain other" POSltlOIlS. When the memberv 9 is in the position "shown in Fig. 1, the blade'me'mber 1 cannot be disengaged from the contact member' o, by reason of its engagement with the shoulders 14 and 15 of the member 9.- In order to open the switch, the attendant must -first move the member 9 toward the contact memher 6 for the purpose of disengagingthe member 1. from the shoulder 15, after which moving'the member 9 back to substantially the position shown in Fig. 1.

When the member 1 is in full engagement with either. of the stationary contact members or is in its mid position, the locking may be effected in the manner indicated in Fig. 1. Shifting of the member 9 to the one or the other of its limiting positions on either-side of the central or looking position,

'asshown in Fig. 1, brings the arcuate edge" 13 to such positionJas topermit the free rotation of thepivot end of the blade member.

It is obvious that many changes may be made in thestructure which I have described and shown'without departingfrom the intent and spirit of my invention which is to be limited only by the scope of the appended claims.

I claim as my invention:'

1. A lock and support at one end between suitable jaws, comprising an adjustable plate located between said hinge-jaws and having projecting portions that are adapted to be engaged by the end of a switch-blade when the plate is in its mid position. one of said projections being removed from such relation when the plate is in one of its extreme positions.

2. A double-throw, knife-blade switch having a sliding plate mounted between its hinge-jaws behind the blade and provided.

with projecting edge portions that are adapted to be engaged by the blade, when the plate is in its mid position and. is out of the pathof movement of the blade when the plate is in one of its extreme positions.

3. A double-throw, knife-blade switch themember 1 ma'ybesecurely locked either, in its mid position or in its position in 'en-igagement .with the contact member 6-.by

. for electrical swltches hailng one or more bladeshinged' provided with a sliding plate having means for adjusting it to lock the switch-blade in each of its full closed positions and the open position and for moving it out of such locking relation.

4. A circuit interrupter comprising two stationary .contact members, a terminal v member, a double-throw knife-blade memher pivoted at one end on the terminal member and a slidable member formed to 006perate with the pivot end of the knife-blade member and the terminal member to permit free movement of the knife-blade memher between the neutral position and each of the closed positions and to preclude movement thereof in both of the closed and neutral po sitions. i

' In testimony whereof, I have hereunto subscribed my name this 30th day of June, 1917.

JOSEPH o. LANGGUTYH. 

